Improvement in fruit-jar covers



`l. L. MASON.

Fruit-Jar Cove-rs.

No.137462, PatemedApl-ilmas.

` GMM/mises.. Jima/ZW UNITED STATES PATENT OFFICE,

JOHN L. MAsoN, or NEW YoEx,-N. Y.

IMPROVEMENT IN FRUIT-JAR COVERS.

Specification forming part of Letters Patent No. 137,462, dated April'1, 1873; application filed February 14, 1870.

To all whom it may concern:

Be it known that'I, JOHN L. MASON, of the city, county, and State of NewYork, have invented a new and useful Improvement in Fruit- J ars; and Ido hereby declare the following to be a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawingforming part of this specification, in which drawing- Figure 1represents a central vertical section of my improvement. Fig. 2 shows amodification in the forln of the cover.

Similar letters indicate corresponding parts.

The letter A designates a glass jar, having a flat shoulder, B, belowits mouth (l, and a screw-thread, D, around its neck below the shoulder.E is a cover, composed of sheet metal, spunv or stamped out into therequired shape, and coated on its under side, where it comes in contactwith the mouth of the jar, with the enamel or glass F. In this examplethe whole ofthe under. surface of the cover is coated, including thepart or flange which rests on the shoulder B; but it is only necessaryto coat that part of the surface which is exposed to contact with thecontents of the `jar, which, in the form here shown, is the upper part,which forms a joint with the mouth C, on Whose top or horizontal edge itrests. on the mouth C, and its sides Gr extend thence downward,corresponding with the lip H of the jar, and then expand about in ahorizontal direction, so as to form a bearing-flange, I, which rests onthe shoulder B, an India-rubber gasket, R, being placed on the shoulderto form a tight joint. The cover is secured to the jar by a continuousscrew-ring, J, which has a horizontal inner top flange, K, so arrangedas to close down upon the iiange I of the cover, and press it upon theshoulder B of the jar.

I am aware that cast-iron jars have been coated with enamel, and I'donot claim, broadly, coating metal with enamel. But in my invention Icombine with a glass jar an elastic sheet-metal cover, which can be spunup or punched and stamped into therequired size and shape, and coatedwith enamel or The top ofthe cover E rests or cracking when the cover isbent in screwf ing it down upon the jar. 1

I apply and combine a coating of glass or vitreous substance to thecover in the following manner: Having placed the cover in an invertedposition, I lay upon that part of its exposed inside surface which is tobe coated a lump of glass, F, of proper size, heated red hot, or to sucha condition as to be plasA tic, so that it will expand under pressurewithout breaking, and apply thereon a powerful pressure by means of adie, using, if necessary, such counter die or surface beneath the coveras will prevent it from losing its proper shape. The coating and coverbecome thereby securely united to each other, and no other fastening isrequired. The metal, being thin, becomes heated by the glass, and incooling both materials shrink about in unison, so that their union isnot impaired. The lump of glass becomes attened under the pressure, andspreads out in all directions under the die, so as to cover the surfacethat is required to be coated.

Fig.2shows, inverted, a modified form of cover where I have madeprovision for the excess, if any, ofthe glass which is forced out laround from under the edges of the die, by forming a hollow circularange, L, between the top of the cover and its sides, which serves as a'receptacle for any glass or coating mate rial ,which is forced out fromunder the edges of the die, and so that the glass will not come incontact with the vertical sides F of the cov-

